Study on distribution characteristics and potential ecological risks of polycyclic aromatic hydrocarbons in the mainstream and tributaries of the Shaanxi section of the Weihe River
Study on distribution characteristics and potential ecological risks of polycyclic aromatic hydrocarbons in the mainstream and tributaries of the Shaanxi section of the Weihe River
[Objective]In order to study the spatial and temporal distribution characteristics of polycyclic aromatic hydrocarbons(PAHs)in the mainstream and tributaries of the Weihe River in Shaanxi Province,and to analyze their sources and potential ec-ological risks,[Methods]gas chromatography-mass spectrometry(GC-MS)was used to quantitatively detect and analyze 15 kinds of PAHs in 30 sampling sites in the study area for two consecutive years.The isomer ratio method was used to analyze the source types and contribution degree,and the potential risks were analyzed by benzo(a)pyrene toxicity equivalent ecological risk as-sessment(TEQBap)and lifetime carcinogenic risk assessment(ILCR).[Results]The result showed that the concentration ofΣPAHs in the water of the Shaanxi section of Weihe River ranged from 0 to 93.00 ng·L-1,with an average of 9.67 ng·L-1.The monomer concentration ranged from 0 to 30.50 ng·L-1,and the detection concentrations of benzoanthracene and fluorene were the highest,with average values of 3.25 ng·L-1 and 2.83 ng·L-1,respectively.In terms of the proportion of rings,polycyclic aro-matic hydrocarbons mainly exist in the form of medium and high rings of three rings,four rings and five rings.[Conclusion]The result showed that the concentration of polycyclic aromatic hydrocarbons in the water-stable period of Shaanxi section of Weihe River was higher than that in the high-water period,and the distribution of polycyclic aromatic hydrocarbons in the high-water period was more single than that in the water-stable period.Polycyclic aromatic hydrocarbons at each sampling point were less than the light pollution level,which was at a low level compared with other rivers at home and abroad.The main source of polycy-clic aromatic hydrocarbons is the combustion of fossil fuels such as coal and biomass,which has certain ecological risks.The carcinogenic risk cannot be ignored.
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